Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:52 gr
Bullet Diameter:0.257"
Bullet Length:<<locked>>
Caliber:.257 Weath. Mag. load data
Case Length (l3):2.549"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:84 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:26"
Max. allowed Pressure:63,817 psi
Load data in caliber .257 Weath. Mag. with .257 | 52gr | Peregrine VRG-3 bullet and 162 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, IMR 4895 and ReloadSwiss RS 70.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 55,999 psi | 88% | 4114 fps | 100% |
| Accurate 2015 | <<locked>> | 84% | 54,940 psi | 86% | 4098 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,624 psi | 90% | 4173 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,753 psi | 87% | 4121 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,201 psi | 85% | 4094 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,693 psi | 84% | 4121 fps | 99.9% |
| Accurate 2520 | <<locked>> | 84% | 56,695 psi | 89% | 4180 fps | 100% |
| Accurate 4064 | <<locked>> | 90% | 56,043 psi | 88% | 4170 fps | 100% |
| Accurate 4064 | <<locked>> | 90% | 54,650 psi | 86% | 4147 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,508 psi | 90% | 4239 fps | 98.3% |
| Accurate 4350 | <<locked>> | 98% | 56,260 psi | 88% | 4216 fps | 98.1% |
| ADI AR 2206H | <<locked>> | 86% | 55,782 psi | 87% | 4203 fps | 98.8% |
| ADI AR 2206H | <<locked>> | 86% | 54,839 psi | 86% | 4186 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 92% | 57,319 psi | 90% | 4199 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 92% | 56,507 psi | 89% | 4186 fps | 98.5% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,418 psi | 85% | 4147 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,334 psi | 90% | 4206 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 84% | 55,172 psi | 86% | 4154 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,186 psi | 85% | 4137 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,565 psi | 89% | 4334 fps | 98.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,666 psi | 87% | 4318 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,653 psi | 90% | 4226 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,637 psi | 89% | 4209 fps | 99.5% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,682 psi | 90% | 4190 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,215 psi | 85% | 4173 fps | 98.2% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,043 psi | 89% | 4236 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,317 psi | 85% | 4239 fps | 98.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 4298 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,028 psi | 88% | 4291 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,056 psi | 86% | 4272 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,974 psi | 66% | 3901 fps | 96.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,434 psi | 88% | 4199 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,564 psi | 87% | 4183 fps | 98.1% |
| Bofors RP3 | <<locked>> | 90% | 54,984 psi | 86% | 4173 fps | 99.4% |
| Bofors RP3 | <<locked>> | 90% | 53,824 psi | 84% | 4147 fps | 99.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,101 psi | 88% | 4140 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,303 psi | 87% | 4127 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,679 psi | 86% | 4167 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,664 psi | 84% | 4147 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,623 psi | 89% | 4295 fps | 98.5% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,680 psi | 87% | 4278 fps | 98.4% |
| Hodgdon H322 | <<locked>> | 82% | 57,711 psi | 90% | 4229 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,912 psi | 88% | 4177 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 90% | 54,868 psi | 86% | 4157 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 86% | 56,347 psi | 88% | 4222 fps | 99.2% |
| Hodgdon H4895 | <<locked>> | 86% | 55,390 psi | 87% | 4206 fps | 99.1% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,491 psi | 85% | 4147 fps | 99.2% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,490 psi | 84% | 4127 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,913 psi | 89% | 4252 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,956 psi | 88% | 4236 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,954 psi | 55% | 2867 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,737 psi | 54% | 2867 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,070 psi | 85% | 4150 fps | 98.9% |
| Hodgdon VARGET | <<locked>> | 88% | 57,043 psi | 89% | 4216 fps | 99.3% |
| IMR 3031 | <<locked>> | 86% | 56,231 psi | 88% | 4232 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,230 psi | 87% | 4216 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,623 psi | 89% | 4180 fps | 98.6% |
| IMR 4064 | <<locked>> | 90% | 55,753 psi | 87% | 4167 fps | 98.5% |
| IMR 4198 | <<locked>> | 82% | 57,130 psi | 90% | 4154 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 54,056 psi | 85% | 4140 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,942 psi | 89% | 4203 fps | 98.3% |
| IMR 4895 | <<locked>> | 88% | 55,637 psi | 87% | 4226 fps | 98.9% |
| IMR 4895 | <<locked>> | 88% | 54,665 psi | 86% | 4206 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 84% | 54,418 psi | 85% | 4147 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 86% | 57,334 psi | 90% | 4206 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 86% | 56,115 psi | 88% | 4177 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,969 psi | 86% | 4154 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,027 psi | 86% | 4117 fps | 98.8% |
| Lovex S060 | <<locked>> | 88% | 57,725 psi | 90% | 4177 fps | 99.1% |
| Lovex S062 | <<locked>> | 90% | 56,478 psi | 89% | 4180 fps | 99.6% |
| Lovex S062 | <<locked>> | 90% | 55,419 psi | 87% | 4160 fps | 99.6% |
| Lovex S065 | <<locked>> | 96% | 56,652 psi | 89% | 4147 fps | 96.9% |
| Lovex S065 | <<locked>> | 96% | 55,622 psi | 87% | 4131 fps | 96.7% |
| Norma 201 | <<locked>> | 86% | 54,273 psi | 85% | 4140 fps | 99.4% |
| Norma 201 | <<locked>> | 88% | 57,014 psi | 89% | 4196 fps | 99.7% |
| Norma 202 | <<locked>> | 86% | 55,056 psi | 86% | 4154 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,099 psi | 85% | 4137 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,246 psi | 90% | 4239 fps | 99.1% |
| Norma 203B | <<locked>> | 90% | 56,246 psi | 88% | 4219 fps | 99% |
| Norma URP | <<locked>> | 98% | 56,086 psi | 88% | 4216 fps | 98% |
| Norma URP | <<locked>> | 98% | 55,085 psi | 86% | 4196 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 88% | 54,708 psi | 86% | 4177 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 88% | 53,780 psi | 84% | 4160 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 98% | 55,463 psi | 87% | 4193 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 98% | 54,505 psi | 85% | 4173 fps | 96.1% |
| Ramshot TAC | <<locked>> | 84% | 55,680 psi | 87% | 4137 fps | 96.8% |
| Ramshot TAC | <<locked>> | 84% | 54,781 psi | 86% | 4121 fps | 96.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,114 psi | 86% | 4167 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,201 psi | 85% | 4150 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,782 psi | 87% | 4134 fps | 98.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,926 psi | 86% | 4121 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,346 psi | 55% | 2930 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,085 psi | 55% | 2927 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,348 psi | 90% | 4206 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,434 psi | 88% | 4193 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,144 psi | 88% | 4140 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,665 psi | 86% | 4259 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,650 psi | 84% | 4239 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,593 psi | 87% | 4308 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,650 psi | 86% | 4288 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 53,563 psi | 84% | 4167 fps | 97.4% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,724 psi | 89% | 4229 fps | 98% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 57,421 psi | 90% | 4285 fps | 97.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,449 psi | 88% | 4265 fps | 97.8% |
| Rottweil R 901 | <<locked>> | 84% | 54,810 psi | 86% | 4147 fps | 100% |
| Rottweil R 901 | <<locked>> | 86% | 57,130 psi | 90% | 4193 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,056 psi | 86% | 4140 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 90% | 57,566 psi | 90% | 4193 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 92% | 54,795 psi | 86% | 4157 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 94% | 57,667 psi | 90% | 4213 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,652 psi | 89% | 4147 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,622 psi | 87% | 4131 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,115 psi | 88% | 4177 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,969 psi | 86% | 4154 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,478 psi | 89% | 4180 fps | 99.6% |
| Shooters World Precision | <<locked>> | 90% | 55,419 psi | 87% | 4160 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 57,145 psi | 90% | 4232 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,217 psi | 88% | 4216 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,911 psi | 84% | 4101 fps | 96.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,014 psi | 89% | 4167 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,549 psi | 85% | 4150 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,638 psi | 90% | 4216 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,448 psi | 87% | 4088 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,563 psi | 86% | 4075 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,608 psi | 89% | 4068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,738 psi | 87% | 4058 fps | 100% |
| Somchem S321 | <<locked>> | 82% | 56,347 psi | 88% | 4180 fps | 99.7% |
| Somchem S321 | <<locked>> | 82% | 55,390 psi | 87% | 4163 fps | 99.6% |
| Somchem S335 | <<locked>> | 86% | 55,143 psi | 86% | 4068 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,201 psi | 85% | 4055 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,551 psi | 90% | 4170 fps | 99.1% |
| Somchem S341 | <<locked>> | 86% | 56,637 psi | 89% | 4157 fps | 99% |
| Somchem S355 | <<locked>> | 92% | 54,810 psi | 86% | 4154 fps | 99.1% |
| Somchem S355 | <<locked>> | 94% | 57,638 psi | 90% | 4213 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 4219 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,548 psi | 84% | 4203 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 82% | 54,766 psi | 86% | 4058 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 57,479 psi | 90% | 4108 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,666 psi | 87% | 4072 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,795 psi | 86% | 4058 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,679 psi | 86% | 4114 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,377 psi | 90% | 4167 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,825 psi | 87% | 4117 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,897 psi | 86% | 4104 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,913 psi | 89% | 4134 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 94% | 55,941 psi | 88% | 4117 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 96% | 54,766 psi | 86% | 4137 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 96% | 53,766 psi | 84% | 4121 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 84% | 55,071 psi | 86% | 4150 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 84% | 54,186 psi | 85% | 4131 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 88% | 54,607 psi | 86% | 4101 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,450 psi | 90% | 4154 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,331 psi | 85% | 4137 fps | 97.5% |
| Vihtavuori N550 | <<locked>> | 98% | 57,174 psi | 90% | 4199 fps | 98.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,282 psi | 73% | 4012 fps | 96.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,078 psi | 71% | 3983 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 56,086 psi | 88% | 4108 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,201 psi | 87% | 4094 fps | 99.6% |
| Winchester 748 | <<locked>> | 84% | 55,593 psi | 87% | 4203 fps | 99.8% |
| Winchester 748 | <<locked>> | 84% | 54,679 psi | 86% | 4186 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,679 psi | 86% | 4154 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,780 psi | 84% | 4137 fps | 99% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 49,197 psi | 77% | 3986 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 48,167 psi | 75% | 3967 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,534 psi | 84% | 4094 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,148 psi | 66% | 3839 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,669 psi | 64% | 3806 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,806 psi | 78% | 4039 fps | 99.7% |
| Accurate 2520 | <<locked>> | 80% | 48,704 psi | 76% | 4019 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 39,740 psi | 62% | 3802 fps | 98.8% |
| Accurate 4064 | <<locked>> | 80% | 38,421 psi | 60% | 3770 fps | 98.5% |
| Accurate 4350 | <<locked>> | 92% | 45,847 psi | 72% | 3976 fps | 95.5% |
| Accurate 4350 | <<locked>> | 92% | 44,657 psi | 70% | 3950 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 45,701 psi | 72% | 3973 fps | 96.7% |
| ADI AR 2206H | <<locked>> | 80% | 44,773 psi | 70% | 3950 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 44,063 psi | 69% | 3898 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 84% | 43,294 psi | 68% | 3878 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,790 psi | 75% | 3999 fps | 98.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,920 psi | 74% | 3980 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 80% | 47,834 psi | 75% | 4019 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 46,862 psi | 73% | 3999 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 45,150 psi | 71% | 4058 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 44,280 psi | 69% | 4032 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,363 psi | 60% | 3766 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,434 psi | 59% | 3737 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 54,027 psi | 85% | 4124 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 44,324 psi | 69% | 3940 fps | 95.8% |
| Alliant Reloder-15 | <<locked>> | 82% | 43,410 psi | 68% | 3917 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 92% | 44,324 psi | 69% | 3990 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 94% | 46,644 psi | 73% | 4052 fps | 96.1% |
| Alliant Reloder-17 | <<locked>> | 84% | 38,783 psi | 61% | 3845 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 86% | 40,901 psi | 64% | 3914 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 98% | 39,102 psi | 61% | 3816 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,498 psi | 71% | 3947 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,628 psi | 70% | 3930 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 38,261 psi | 60% | 3763 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 37,144 psi | 58% | 3730 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,153 psi | 77% | 3996 fps | 99.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,356 psi | 76% | 3980 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,442 psi | 74% | 4009 fps | 98.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,456 psi | 73% | 3986 fps | 98.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,272 psi | 82% | 4203 fps | 97.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,387 psi | 81% | 4186 fps | 97.6% |
| Hodgdon H322 | <<locked>> | 80% | 53,766 psi | 84% | 4154 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 48,399 psi | 76% | 4009 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 86% | 47,398 psi | 74% | 3986 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 46,122 psi | 72% | 3993 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 80% | 45,223 psi | 71% | 3970 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 38,189 psi | 60% | 3753 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 40,132 psi | 63% | 3809 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,380 psi | 66% | 3917 fps | 96.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,466 psi | 65% | 3894 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,759 psi | 40% | 2595 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,527 psi | 40% | 2592 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,208 psi | 69% | 3921 fps | 96.9% |
| Hodgdon VARGET | <<locked>> | 80% | 43,424 psi | 68% | 3901 fps | 96.6% |
| IMR 3031 | <<locked>> | 80% | 45,368 psi | 71% | 4009 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 44,396 psi | 70% | 3986 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 43,381 psi | 68% | 3878 fps | 95.6% |
| IMR 4064 | <<locked>> | 82% | 42,525 psi | 67% | 3855 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 53,780 psi | 84% | 4094 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 43,830 psi | 69% | 3904 fps | 95% |
| IMR 4831 | <<locked>> | 94% | 46,021 psi | 72% | 3960 fps | 95.8% |
| IMR 4895 | 59.8 gr | 80% | 42,380 psi | 66% | 3904 fps | 95.7% |
| IMR 4895 | 59.8 gr | 80% | 41,452 psi | 65% | 3881 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 47,790 psi | 75% | 3999 fps | 98.4% |
| IMR 8208 XBR | <<locked>> | 80% | 46,920 psi | 74% | 3980 fps | 98.2% |
| Lovex D073.6 | <<locked>> | 80% | 45,179 psi | 71% | 3944 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 80% | 44,063 psi | 69% | 3917 fps | 98.9% |
| Lovex S060 | <<locked>> | 80% | 45,252 psi | 71% | 3898 fps | 96.7% |
| Lovex S060 | <<locked>> | 80% | 44,454 psi | 70% | 3878 fps | 96.5% |
| Lovex S062 | <<locked>> | 80% | 40,379 psi | 63% | 3802 fps | 96.6% |
| Lovex S062 | <<locked>> | 80% | 39,407 psi | 62% | 3776 fps | 96.3% |
| Lovex S065 | <<locked>> | 92% | 49,530 psi | 78% | 3993 fps | 95.1% |
| Lovex S065 | <<locked>> | 94% | 51,953 psi | 81% | 4052 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 44,614 psi | 70% | 3914 fps | 97.7% |
| Norma 201 | <<locked>> | 80% | 43,569 psi | 68% | 3891 fps | 97.5% |
| Norma 202 | <<locked>> | 80% | 44,976 psi | 70% | 3937 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 44,019 psi | 69% | 3914 fps | 99.3% |
| Norma 203B | <<locked>> | 80% | 40,741 psi | 64% | 3842 fps | 95.2% |
| Norma 203B | <<locked>> | 82% | 42,743 psi | 67% | 3898 fps | 95.9% |
| Norma URP | <<locked>> | 92% | 45,484 psi | 71% | 3976 fps | 95.3% |
| Norma URP | <<locked>> | 92% | 44,498 psi | 70% | 3953 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 40,857 psi | 64% | 3845 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 82% | 42,902 psi | 67% | 3901 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 96% | 51,503 psi | 81% | 4104 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 96% | 50,575 psi | 79% | 4088 fps | 95.1% |
| Ramshot TAC | <<locked>> | 82% | 51,706 psi | 81% | 4052 fps | 95.9% |
| Ramshot TAC | <<locked>> | 82% | 50,821 psi | 80% | 4035 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,688 psi | 75% | 4006 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,818 psi | 73% | 3983 fps | 97.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,054 psi | 82% | 4055 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,198 psi | 80% | 4039 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,005 psi | 41% | 2651 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,730 psi | 40% | 2648 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,563 psi | 84% | 4131 fps | 99.8% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,678 psi | 83% | 4117 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 52,475 psi | 82% | 4058 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,729 psi | 69% | 3996 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,772 psi | 67% | 3973 fps | 95% |
| ReloadSwiss RS 60 | 62.7 gr | 80% | 35,723 psi | 56% | 3773 fps | 96.3% |
| ReloadSwiss RS 60 | 62.7 gr | 80% | 34,867 psi | 55% | 3747 fps | 95.9% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 46,108 psi | 72% | 3993 fps | 95.3% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 45,049 psi | 71% | 3967 fps | 95% |
| ReloadSwiss RS 70 | 74.8 gr | 94% | 49,385 psi | 77% | 4101 fps | 95.9% |
| ReloadSwiss RS 70 | 74.8 gr | 94% | 48,515 psi | 76% | 4081 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 48,283 psi | 76% | 4006 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 80% | 47,108 psi | 74% | 3983 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 80% | 42,206 psi | 66% | 3842 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 80% | 41,162 psi | 65% | 3816 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 38,450 psi | 60% | 3757 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 84% | 40,263 psi | 63% | 3809 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 49,530 psi | 78% | 3993 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 51,953 psi | 81% | 4052 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,179 psi | 71% | 3944 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,063 psi | 69% | 3917 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 40,379 psi | 63% | 3802 fps | 96.6% |
| Shooters World Precision | <<locked>> | 80% | 39,407 psi | 62% | 3776 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 42,888 psi | 67% | 3907 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 41,989 psi | 66% | 3881 fps | 95.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,528 psi | 73% | 3934 fps | 95% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 49,110 psi | 77% | 3996 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,353 psi | 70% | 3914 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,482 psi | 68% | 3891 fps | 96.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,571 psi | 71% | 3878 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,701 psi | 70% | 3862 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,985 psi | 60% | 3665 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,159 psi | 58% | 3645 fps | 98.8% |
| Somchem S321 | <<locked>> | 80% | 52,460 psi | 82% | 4104 fps | 99.3% |
| Somchem S321 | <<locked>> | 80% | 51,488 psi | 81% | 4085 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 45,542 psi | 71% | 3871 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 44,614 psi | 70% | 3852 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 46,267 psi | 73% | 3930 fps | 96.9% |
| Somchem S341 | <<locked>> | 80% | 45,397 psi | 71% | 3914 fps | 96.7% |
| Somchem S355 | <<locked>> | 82% | 39,102 psi | 61% | 3773 fps | 95.2% |
| Somchem S355 | <<locked>> | 84% | 40,973 psi | 64% | 3829 fps | 95.9% |
| Somchem S365 | <<locked>> | 88% | 35,317 psi | 55% | 3724 fps | 95.3% |
| Somchem S365 | <<locked>> | 90% | 36,985 psi | 58% | 3783 fps | 96.2% |
| Vihtavuori N130 | <<locked>> | 80% | 51,401 psi | 81% | 3996 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 50,546 psi | 79% | 3983 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,876 psi | 72% | 3881 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,049 psi | 71% | 3865 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,568 psi | 65% | 3839 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,553 psi | 64% | 3816 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 42,569 psi | 67% | 3835 fps | 99.3% |
| Vihtavuori N140 | <<locked>> | 80% | 41,640 psi | 65% | 3816 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 80% | 34,838 psi | 55% | 3602 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 82% | 36,506 psi | 57% | 3655 fps | 96% |
| Vihtavuori N160 | <<locked>> | 92% | 47,514 psi | 74% | 3976 fps | 95.9% |
| Vihtavuori N160 | <<locked>> | 92% | 46,557 psi | 73% | 3960 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 47,935 psi | 75% | 3993 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 80% | 47,065 psi | 74% | 3973 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 80% | 41,452 psi | 65% | 3802 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,538 psi | 64% | 3783 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 92% | 47,079 psi | 74% | 3976 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 92% | 46,079 psi | 72% | 3953 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 98% | 43,178 psi | 68% | 3934 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 98% | 42,047 psi | 66% | 3901 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 38,899 psi | 61% | 3704 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 38,072 psi | 60% | 3681 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 48,138 psi | 75% | 4045 fps | 99.1% |
| Winchester 748 | <<locked>> | 80% | 47,210 psi | 74% | 4026 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,106 psi | 69% | 3914 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,163 psi | 68% | 3891 fps | 96.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 207 powders for .257 Weath. Mag. loaded with the .257 | 52gr | Peregrine VRG-3. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 4,334 fps; across all powders the maximum-charge window runs from 2,867 fps to 4,334 fps. Accurate 3100 gives the best case fill at 100 %, and 207 of the 207 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. Accurate 3100, Accurate 3100, ADI AR 2209 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 60, IMR 4895, ReloadSwiss RS 70 rank at the top here: for .257 Weath. Mag. with the .257 | 52gr | Peregrine VRG-3 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 2700, Accurate 3100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.